Cross Compile Linux

5/28/2018 Cross Compile Linux

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Shuah KhanSenior Linux Kernel Developer Open Source Group

Samsung Research America (Silicon Valley)shuah.h!samsung.com

"ross#compiling Linux Kernels onx$%&%' A uorial on *o+ o Ge

Sare,
mailto:[email protected]:[email protected]


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Agenda

Cross-compile value proposition

Preparing the system for cross-compiler installation

Cross-compiler installation steps

Demo install arm and arm64

Compiling on architectures

Demo compile arm and arm64

Automating cross-compile testing

Upstream cross-compile testing activity

References and Package repositories

!A


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"#$ architectures supported %several su&-archs'

(ative compile testing re)uires *ide range of testsystems not practical

A&ility to cross-compile non-natively on an *idelyavaila&le architecture helps detect compile errors

Coupled *ith emulation environments %e+g, )emu' testingon non-native architectures &ecomes easier

etting up cross-compile environment is the first andnecessary step


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arch.

alpha

arc

arm

arm64

avr32

c6x

cris

frv

m32r

hexagon

ia64

m68k

metag

microblaze

mn10300

mips

openrisc

h8300

parisc

powerpc

s390

score

xtensa

sparc

tile

um

unicore32

x86

x86_64

sh

blackfin


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Cross-compiler packages

U&untu arm packages %/0+/# or later'

gcc-arm-linu1-gnuea&i

gcc-arm-linu1-gnuea&ihf

U&untu arm64 packages %/"+#4 or later' use arm64repo for older U&untu releases+

gcc-4+2-aarch64-linu1-gnu

U&untu keeps adding support for compilers+ earch

U&untu repository for packages+


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3m&edded De&ian Proectis a good resource for alpha5mips5 mipsel5 po*erpc5 sh5 and sparc cross-compilers+

gcc-4+2-alpha-linu1-gnu

gcc-4+2-mips-linu1-gnu gcc-4+2-mipsel-linu1-gnu

gcc-4+2-po*erpc-linu1-gnu

gcc-4+2-sh4-linu1-gnu

gcc-4+2-sparc-linu1-gnu
http://www.emdebian.org/http://www.emdebian.org/


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edora repoand edora 3pel Repoare a good sources for severalcross-compilers and &inutils rpms

&lackfin

&inutils-&fin-linu1-gnu-0+0"+7/+#+"-/+fc/2+186964+rpm

gcc-&fin-linu1-gnu-4+2+/-#+/+0#/0#6#6+fc/2+186964+rpm

c61

&inutils-c61-linu1-gnu-0+0"+7/+#+"-/+fc/2+186964+rpm

gcc-c61-linu1-gnu-4+2+0-0+aa+0#/0///4svn+fc/2+186964+rpm

tile

&inutils-tile-linu1-gnu-0+0"+7/+#+"-/+fc/2+186964+rpm

gcc-tile-linu1-gnu-4+2+0-0+aa+0#/0///4svn+fc/2+186964+rpm
http://dl.fedoraproject.org/pub/fedora/linux/updates/testing/17/x86_64/http://dl.fedoraproject.org/pub/epel/6/x86_64/http://dl.fedoraproject.org/pub/epel/6/x86_64/http://dl.fedoraproject.org/pub/fedora/linux/updates/testing/17/x86_64/


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Preparing the system forcross-compiler installation

Choose an 186-64 system

:nstall U&untu /0+/# or later+

U&untu /"+#4 :nstall
http://www.ubuntu.com/download/desktop/install-desktop-latesthttp://www.ubuntu.com/download/desktop/install-desktop-latest


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:nstall common packages

suo apt"get install binutils"multiarch

suo apt"get install ncurses"ev

suo apt"get install alien

suo apt"get install buil"essential

#ote$ ncurses"ev is re%uire to run menuconfig an alien to generate &eb from &rpm


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Configure apt for arm64 repo%U&untu /0+/#'

wget "' " http$((people&ebian&org()wooke*(bootstrap(bootstrap"archive&ke*+ suo apt"ke* a

suo apt"a"repositor* ,eb http$((people&ebian&org()wooke*(bootstrap(ubunturepo(%uantal"bootstrap main,

suo apt"get upate
http://people.debian.org/~wookey/bootstrap/bootstrap-archive.keyhttp://people.debian.org/~wookey/bootstrap/ubunturepo/http://people.debian.org/~wookey/bootstrap/ubunturepo/http://people.debian.org/~wookey/bootstrap/bootstrap-archive.key


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Configure apt for emde&ian repo

suo apt"get install emebian"archive"ke*ring

-reate (etc(apt(sources&list&(emebian&list file with the following line$ eb http$((www&emebian&org(ebian( si main


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Do*nload rpms from fedora repo

&lackfin rpms,

&inutils-&fin-linu1-gnu-0+0"+7/+#+"-/+fc/2+186964+rpm

gcc-&fin-linu1-gnu-4+2+/-#+/+0#/0#6#6+fc/2+186964+rpm

c61 rpms, &inutils-c61-linu1-gnu-0+0"+7/+#+"-/+fc/2+186964+rpm

gcc-c61-linu1-gnu-4+2+0-0+aa+0#/0///4svn+fc/2+186964+rpm

tile rpms

&inutils-tile-linu1-gnu-0+0"+7/+#+"-/+fc/2+186964+rpm

gcc-tile-linu1-gnu-4+2+0-0+aa+0#/0///4svn+fc/2+186964+rpm

(ote, gcc-tile-linu1-gnu-4+2+0-0+aa+0#/0///4svn+fc/2+186964+rpm is*hat you *ant+ ;he older version is missing feed&ack+h5 tileg1 needs+


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Convert rpms to +de&

suo alien " binutils"bfin"linux"gnu"2&23&.1&0&3"1&fc1/&x86_64&rpm

suo alien " gcc"bfin"linux"gnu"4&/&1"0&1&20120606&fc1/&x86_64&rpm

suo alien " binutils"c6x"linux"gnu"2&23&.1&0&3"1&fc1/&x86_64&rpm

suo alien " gcc"c6x"linux"gnu"4&/&2"2&aa&20121114svn&fc1/&x86_64&rpm

suo alien " binutils"tile"linux"gnu"2&23&.1&0&3"1&fc1/&x86_64&rpm

suo alien " gcc"tile"linux"gnu"4&/&2"2&aa&20121114svn&fc1/&x86_64&rpm

You will see warnings about missing keys e.g: below which you can safely ignore.warning: gcc-tile-linux-gnu-4.7.2-2.aa.20121114svn.fc17.x!"!4.r#m:$ea%er &' ()*+)$*2,! )ignature key / 1aca'4!,: 3Y


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Resulting +de&s

&inutils-&fin-linu1-gnu90+0"+7/+#+"-09amd64+de&

&inutils-c61-linu1-gnu90+0"+7/+#+"-09amd64+de&

&inutils-tile-linu1-gnu90+0"+7/+#+"-09amd64+de&

gcc-&fin-linu1-gnu94+2+/-/+/9amd64+de& gcc-c61-linu1-gnu94+2+0-"9amd64+de&

gcc-tile-linu1-gnu94+2+0-"9amd64+de&


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:nstall cross-compilers

alphasuo apt"get install ""install"recommens gcc"4&/"alpha"linux"gnu

suo ln "s (usr(bin(alpha"linux"gnu"gcc"4&/ (usr(bin(alpha"linux"gnu"gcc

armsuo apt"get install gcc"arm"linux"gnueabi

arm64suo apt"get install ""install"recommens gcc"4&/"aarch64"linux"gnu

suo ln "s (usr(bin(aarch64"linux"gnu"gcc"4&/ (usr(bin(aarch64"linux"gnu"gcc

mips

suo apt"get install ""install"recommens gcc"4&/"mips"linux"gnu suo ln "s (usr(bin(mips"linux"gnu"gcc"4&/ (usr(bin(mips"linux"gnu"gcc

mipselsuo apt"get install ""install"recommens gcc"4&/"mipsel"linux"gnu

suo ln "s (usr(bin(mipsel"linux"gnu"gcc"4&/ (usr(bin(mipsel"linux"gnu"gcc


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powerpcsuo apt"get install ""install"recommens gcc"4&/"powerpc"linux"gnu

suo ln "s (usr(bin(powerpc"linux"gnu"gcc"4&/ (usr(bin(powerpc"linux"gnu"gcc

shsuo apt"get install ""install"recommens gcc"4&/"sh4"linux"gnu

suo ln "s (usr(bin(sh4"linux"gnu"gcc"4&/ (usr(bin(sh4"linux"gnu"gcc

arm64suo apt"get install ""install"recommens gcc"4&/"aarch64"linux"gnu

suo ln "s (usr(bin(aarch64"linux"gnu"gcc"4&/ (usr(bin(aarch64"linux"gnu"gcc

sparcsuo apt"get install ""install"recommens gcc"4&/"sparc"linux"gnu suo ln "s (usr(bin(sparc"linux"gnu"gcc"4&/ (usr(bin(sparc"linux"gnu"gcc

Note: Creating link to *arch*-linux-gnu-gcc is necessary as theCROSS_COMPILE irecti!e

to "in the co#$ilers%


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:nstall cross-compilers from +de&s

blackfinsuo pkg "i binutils"bfin"linux"gnu_2&23&.1&0&3"2_am64&eb

suo pkg "i gcc"bfin"linux"gnu_4&/&1"1&1_am64&eb

c6xsuo pkg "i binutils"c6x"linux"gnu_2&23&.1&0&3"2_am64&eb

suo pkg "i gcc"c6x"linux"gnu_4&/&2"3_am64&eb

tilesuo pkg "i binutils"tile"linux"gnu_2&23&.1&0&3"2_am64&eb suo pkg "i gcc"tile"linux"gnu_4&/&2"3_am64&eb


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arch.compile

alpha

arc

arm

arm64

avr32

c6x

cris

frv

m32r

hexagon

ia64

m68k

metag

microblaze

mn10300

mips

openrisc

h8300

parisc

powerpc

s390

score

xtensa

sparc

tile

um

unicore32

x86

x86_64

sh

blackfin


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s &uild9crossscript

do*nloads compiler sources for a specified arch fromgnu repo5 &uilds and installs+

Usage, &uild9cross arm

Runs on fedora
http://mchehab.fedorapeople.org/build_crosshttp://mchehab.fedorapeople.org/build_cross


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Demo arm and arm64 install


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Compilation ;ips

:f make ARC?@arch defconfig fails on an arch5 pick aconfig to test from arch..configs

ome architectures don>t support defconfig in

cross-compile mode+ e+g, po*erpc+ :n some cases5 you might see errors in BD phase5 and

please keep in mind these are ust compile tests+


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alphamake istclean

make -alpha efconfig -alpha -'_-'57alpha"linux"gnu" make all

Cross-compiling

arm

make istclean make -arm efconfig -arm -'_-'57arm"linux"gnueabi" make all

arm64 :3&/ an later;make istclean

make -arm64 efconfig -arm64 -'_-'57aarch64"linux"gnu" make all

blackfinmake istclean

make -blackfin efconfig-blackfin -'_-'57bfin"linux"gnu" make all


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mips

make istclean make -mips efconfig

-mips -'_-'57mips"linux"gnu" make all

Cross-compiling

mipselmake istclean

make -mips efconfig

-mips -'_-'57mipsel"linux"gnu" make all

powerpcmake istclean

cp arch(powerpc(configs(wii_efconfig &config -powerpc -'_-'57powerpc"linux"gnu" make all

c6x :3&4 an later;make istclean

make -c6x efconfig -arm64 -'_-'57aarch64"linux"gnu" make all


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sparcmake istclean

make -sparc efconfig -sparc -'_-'57sparc"linux"gnu" make all

Cross-compiling

tilemake istclean

make -tile efconfig -tile -'_-'57tile"linux"gnu" make all

shmake istclean

make -sh efconfig -sh -'_-'57sh4"linux"gnu" make all


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Demo arm and arm64 compilation


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Automating cross-compile testing

cript cross9compile+shautomates &uilds for thecompilers mentioned in this talk

ktest crosstests+conf


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Upstream Cross-compile testingactivity

Binu1 ernel sta&le )ueue &uilds proect

uenter Rock keeps adding ne* compilers each*eek+

Configs, allmodconfig5 defconfig5 configs *ith mmu

and *ithout %nommu' *here applica&le+

)emu test results on selected architectures+
http://server.roeck-us.net:8010/buildershttp://server.roeck-us.net:8010/builders


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References and Packagerepositories

AR=v8 De&ian and U&untu &ootstrap repositories

3m&edded De&ian Proect

edora Repo

edora 3pel Repo ernel+org - crosstool

U&untu /"+#4 :nstall


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Q&A


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Shuah KhanSenior Open Source Developer Open Source GroupSamsung Research America (Silicon Valley)

shuah.h!samsung.com

-han you.
mailto:[email protected]:[email protected]


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ummary

Cross-compiling Binu1 ernels on 186964, A tutorial on ?o* to ettarted

Agenda


arch.




Preparing the system for cross-compiler installation

:nstall common packages

Configure apt for arm64 repo %U&untu /0+/#' Configure apt for emde&ian repo

Do*nload rpms from fedora repo

Convert rpms to +de&

Resulting +de&s



:nstall cross-compilers from +de&s

arch.compile

Cross Compile Linux

Documents

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